Backlight current limiting resistor
Are they integrated into the display? I didn't see any reference to it in the datasheet of the following display, and just wanted to be certain before completing PCB layout.
No, that display is a Chip-On-Glass LCD, and contains no electronic components except for the controller IC bonded to the glass.0
Appreciate it Michael. Any recommended values? Suppose I can grab a unit and calculate a sample forward voltage myself, but are there any standard values that work well, independent of manufacturing tolerances?0
It really depends on how bright you want the backlight to be. I'd say around 100Ω.0
Please can you confirm that being COG does not in itself imply that a display has no current limiting resistors for the backlight? I'm looking at NHD-C12864A1Z-FS(RGB)-FBW-HT1, and it appears to show some in the "Mechanical Drawing" LED circuit, but now I'm not quite sure. Thanks.0
NHD-C12864A1Z-FS(RGB)-FBW-HT1 is a COG display, however the glass is attached to a pcb which contains current limiting resistors, please see page 3 in the displays datasheet.
Thats good, thanks.0
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